If it wasn’t clear how vicious a grizzly bear could be before, then this one’s here to make it make it obvious.

After noticing a grizzly while out hunting with his dad, Logan Hunter got his camera ready and started following it. He followed the grizzly to a black bear den where it proceeded to attack a black bear sow and her three cubs while tearing their den apart.

Despite the mama bears efforts, the grizzly got one of her cubs but she was able to escape with the other two.